Outlook Web Add-In error 'There were deployment errors. Continue?' - outlook-addin

Question

Currently I'm working on an Outlook Add-In using Visual Studio 2022 with React (TypeScript). When starting the application a message box appears containing following message:
There were deployment errors. Continue?
The output of the build console doesn't help at all because it only says that an error has occurred but without any further information.
Is there any way to get more error details or does anyone know how to fix this?
Manifest:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<OfficeApp xmlns="http://schemas.microsoft.com/office/appforoffice/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bt="http://schemas.microsoft.com/office/officeappbasictypes/1.0" xmlns:mailappor="http://schemas.microsoft.com/office/mailappversionoverrides/1.0" xsi:type="MailApp">
<Id>0ca51293-705c-45d5-975c-e59909dab3ea</Id>
<Version>1.0.0.0</Version>
<ProviderName>Company</ProviderName>
<DefaultLocale>de-DE</DefaultLocale>
<DisplayName DefaultValue="OutlookAddInWeb" />
<Description DefaultValue="OutlookAddInWeb Description" />
<IconUrl DefaultValue="~remoteAppUrl/Images/Button64x64.png" />
<HighResolutionIconUrl DefaultValue="~remoteAppUrl/Images/Button80x80.png" />
<SupportUrl DefaultValue="https://www.somesite.com/" />
<AppDomains>
<AppDomain>https://login.microsoftonline.com</AppDomain>
<AppDomain>https://localhost:44488</AppDomain>
</AppDomains>
<Hosts>
<Host Name="Mailbox" />
</Hosts>
<Requirements>
<Sets>
<Set Name="Mailbox" MinVersion="1.1" />
</Sets>
</Requirements>
<FormSettings>
<Form xsi:type="ItemEdit">
<DesktopSettings>
<SourceLocation DefaultValue="~remoteAppUrl/" />
</DesktopSettings>
</Form>
</FormSettings>
<Permissions>ReadWriteItem</Permissions>
<Rule xsi:type="ItemIs" ItemType="Message" FormType="Edit" />
<DisableEntityHighlighting>false</DisableEntityHighlighting>
<VersionOverrides xmlns="http://schemas.microsoft.com/office/mailappversionoverrides" xsi:type="VersionOverridesV1_0">
<VersionOverrides xmlns="http://schemas.microsoft.com/office/mailappversionoverrides/1.1" xsi:type="VersionOverridesV1_1">
<Requirements>
<bt:Sets DefaultMinVersion="1.5">
<bt:Set Name="Mailbox" />
</bt:Sets>
</Requirements>
<Hosts>
<Host xsi:type="MailHost">
<DesktopFormFactor>
<FunctionFile resid="Commands.Url" />
<ExtensionPoint xsi:type="MessageComposeCommandSurface">
<OfficeTab id="TabDefault">
<Group id="msgComposeGroup">
<Label resid="GroupLabel" />
<Control xsi:type="Button" id="msgComposeOpenPaneButton">
<Label resid="TaskpaneButton.Label" />
<Supertip>
<Title resid="TaskpaneButton.Label" />
<Description resid="TaskpaneButton.Tooltip" />
</Supertip>
<Icon>
<bt:Image size="16" resid="Icon.16x16" />
<bt:Image size="32" resid="Icon.32x32" />
<bt:Image size="80" resid="Icon.80x80" />
</Icon>
<Action xsi:type="ShowTaskpane">
<SourceLocation resid="Taskpane.Url" />
</Action>
</Control>
<Control xsi:type="Button" id="ActionButton">
<Label resid="ActionButton.Label" />
<Supertip>
<Title resid="ActionButton.Label" />
<Description resid="ActionButton.Tooltip" />
</Supertip>
<Icon>
<bt:Image size="16" resid="Icon.16x16" />
<bt:Image size="32" resid="Icon.32x32" />
<bt:Image size="80" resid="Icon.80x80" />
</Icon>
<Action xsi:type="ExecuteFunction">
<FunctionName>action</FunctionName>
</Action>
</Control>
</Group>
</OfficeTab>
</ExtensionPoint>
</DesktopFormFactor>
</Host>
</Hosts>
<Resources>
<bt:Images>
<bt:Image id="Icon.16x16" DefaultValue="~remoteAppUrl/Images/Button16x16.png" />
<bt:Image id="Icon.32x32" DefaultValue="~remoteAppUrl/Images/Button32x32.png" />
<bt:Image id="Icon.80x80" DefaultValue="~remoteAppUrl/Images/Button80x80.png" />
</bt:Images>
<bt:Urls>
<bt:Url id="Commands.Url" DefaultValue="~remoteAppUrl/commands.html" />
<bt:Url id="Taskpane.Url" DefaultValue="~remoteAppUrl/" />
</bt:Urls>
<bt:ShortStrings>
<bt:String id="GroupLabel" DefaultValue="Outlook Add-in" />
<bt:String id="TaskpaneButton.Label" DefaultValue="Show Taskpane" />
<bt:String id="ActionButton.Label" DefaultValue="Perform an action" />
</bt:ShortStrings>
<bt:LongStrings>
<bt:String id="TaskpaneButton.Tooltip" DefaultValue="Opens a pane displaying all available properties." />
<bt:String id="ActionButton.Tooltip" DefaultValue="Perform an action when clicked." />
</bt:LongStrings>
</Resources>
<WebApplicationInfo>
<Id>1d32bd7d-70ab-42b5-b11a-8e73a6b8ab4a</Id>
<Resource>api://localhost:44488/1d32bd7d-70ab-42b5-b11a-8e73a6b8ab4a</Resource>
<Scopes>
<Scope>openid</Scope>
<Scope>profile</Scope>
</Scopes>
</WebApplicationInfo>
</VersionOverrides>
</VersionOverrides>
</OfficeApp>

Answer 1

Use https://learn.microsoft.com/en-us/office/dev/add-ins/testing/troubleshoot-manifest to validate your manifest file. There are issues with your manifest file.