dropbox chooser 403 error for webapp on iPad/iPhone - dropbox

I am new to dropbox.I have tried to integrate dropbox chooser and it worked well with the code given on the official site for developers at https://www.dropbox.com/developers on the desktop browsers.But when I tried to do it with iPhode or iPad it gives me 403 error irrespective to i have logged in or not.
So,Please guide me further.

you must test your ip addresses.

I tested it and the error was i put localhost.

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Can't get my app reviewed in Facebook API

I can't get my app to be reviewed through the Facebook API.
The app is purely a facebook messenger bot, and the app type is "business".
I have configured the specific permissions I need, however I recieve an error that states "You do not have any platforms eligible for review. Please configure a platform on your Settings page."
I also cannot add my app domain in the basic settings, as whenever I press save changes, the url does not save and disappears.
Additionally there is no option to make my app live.
Any advice?
The error message
I am leaving this answer in the event someone else needs it. It was an answer suggested by Facebook support when I encountered the same problem.
Go into App Settings and add a platform "Website"
Just add your website URL.
If the requested permission is just Messenger based then the website will not be accessed or tested.

Botframework v4 - Facebook Channel - Operation returned an invalid status code 'Forbidden`

Last year I developed a chatbot with Microsoft Bot Framework that I integrated in the Facebook Messenger of a page. Everything worked fine until 16th of December (last successful log). The page is not used by a lot of people therefore the application might have worked also longer than that.
Today I tried to use the chatbot again and I did not get any response. In the Logs I just found the error message "Operation returned an invalid status code 'Forbidden`".
After a bit of Debugging I found out that the problem is sending messages back to the Facebook Messenger.
context.SendActivityAsync(...)
I did not change any configuration within my Azure Bot Channel registration recently. I am aware of the privacy changes within the Facebook API, but as I already struggle with sending a simple text response like "Hi" I assume that cannot be the problem. Also the permission scheme has changed for Facebook apps. I have the permission for "pages_messaging". Do I need another permission now? Or did I miss another change in the Facebook API?
Technical Details:
Facebook API Version v6 (tried also v9 but no change in behavior)
Chatbot based on .Net Core 2.1
Bot Builder SDK v 4.11
Any hints what I did wrong or where I can look for further information is much appreciated.
Edit: I tried to add a new page to my Facebook App and get following message:
There is a hint that a permission is missing, but I cannot find out which one I require. As I only send responses to FAQ's and if required handover to the customer service inbox I just requested the "pages_messaging" permission. Do I require any other permission now?
I found the problem. For everyone that might have the same problem:
In our case the administrator that added the Facebook pages to the application was removed from the admin permission list of the pages. After re-adding the admin permissions for the pages the bot started working again.

Authentication returns 400 and "something went wrong" but works in incognito mode

I've been developing authentication flow on php lib: googleapis/google-api-php-client v2.9.1. Everything was working fine, but after some time while trying to authenticate the google started displaying "Something went wrong" message with 500 in console and after pressing next button "The server cannot process the request because it is malformed. It should not be retried. That’s all we know." with 400 code. But everything works fine if I use incognito mode.
The similar issue is described here and it only occurs on chrome and when user is logged in into several google accounts, works fine if you delete accounts.google.com domain cookies or use Incognito mode.
Is there a way to solve it ?
So to answer my own question the solution was quite simple - after you apply for verification and Google verifies your app this issue disappears without any additional efforts.
I assume that main issue is that if you have multiple google accounts connected to your chrome and you add only some of them to an app as a tester or etc. Google can't handle not connected accounts for security measures and returns an error. Of course the error itself could be handled little bit better.
I hope this answer saves some time for everyone else who is struggling with this issue.

How to implement Google authentication using Xamarin.Forms?

I am developing a login feature in that user can login into the application using the Google account and get user profile detail. For that, I am creating a project in google developers and it's verified by me.
I try with this reference here but when I try with this that is give me the error of "Disallowed user agent" and gives me the error of the open in safari or chrome when I try with the iPhone(iOS devices).
I also go through some other references like "Xamarin. Auth" but it doesn't work for me. When I set a redirection URL with clientId:/oauth2redirect or the Package Name(Bundle Identifier):/oauth2redirect . It gives me an exception of Not valid redirect Uri.
I also try to add JSON and p12 file on respective device-specific projects and set bundle resource but it doesn't work me.
If anyone has solution to this without using WebView than help me.
You can try this plugin from CroosGeeks
https://github.com/CrossGeeks/GoogleClientPlugin
Here is the sample app:
https://github.com/CrossGeeks/GoogleClientPlugin/tree/master/GoogleClient/GoogleClientSample
This is not using the WebView. The documentation is also quite good.

Why can't Google Webmaster verify my websites subdomain?

Okay, so I have my main site, www.mydomain.com.au along with my mobile site which is within a subdomain, m.mydomain.com.au.
I am trying to submit my subdomain to Google Webmaster Tools, although it cannot seem to verify it. I have tried with the HTML file upload and the meta tag option to.
I can verify that the Google HTML file is DEFINITELY uploaded since the link Google provides to check if it is there is working perfectly. Also, I have checked my source code and the meta tag is also definitely there.
My .htaccess file has a mobile redirect so I thought that may have been the problem, so I deleted that file to check if it would validate, but still no luck.
I have approximately 12 websites that are setup the EXACT same as this one, and all of their mobile sites/subdomains verified with Webmaster Tools perfectly.
This is my error message: We were unable to connect to your server.
Does anyone have any suggestions to why Google cannot verify my mobile site?
Google doesn't see sub domains...they see the folder where the sub domain is located. Delete the site and add is again as mydomain.com.au/m
Google will see it and add it to Webmaster tools...I just did this for my sub domain. That's how I worked it out...
You can verify them from here https://www.google.com/webmasters/verification/home?hl=en
It is wrong that google is not seeing sub domains. you can check it with site:yoururl. with your main domain you will get your sub domain as well.