Power Automate HTTP Failure Invalid value for header Content-Language. - Ebay API - api

Question

Using test listing information I'm trying to send a http put request to eBay using powerautomate. To set up my HTTP action I've followed the API instructions for the createOrReplaceInventoryItem action.
Ebay API Documentation
I continue to get the below error:
{"errors":[{"errorId":25709,"domain":"API_INVENTORY","subdomain":"Selling","category":"REQUEST","message":"Invalid
value for header Content-Language."}]}
I have read many articles where they have suggested changing Content-Language to Accepted-Language but that has not resolved the issue. Another article said to assign it to the HTTPContent instance but I'm unaware how to do this within powerapps.
Link to Suggestion on this thread
Here is the Request:
{
"uri": "https://api.ebay.com/sell/inventory/v1/inventory_item/TestMonkey",
"method": "PUT",
"headers": {
"Authorization": "*sanitized*",
"Content-Language\t": "en_US",
"Content-Type": "application/json",
"X-EBAY-C-MARKETPLACE-ID": "EBAY_US"
},
"body": {
"availability": {
"shipToLocationAvailability": {
"quantity": 50
}
},
"condition": "NEW",
"product": {
"title": "GoPro Hero4 Helmet Cam",
"description": "New GoPro Hero4 Helmet Cam. Unopened box.",
"aspects": {
"Brand": [
"GoPro"
],
"Type": [
"Helmet/Action"
],
"Storage Type": [
"Removable"
],
"Recording Definition": [
"High Definition"
],
"Media Format": [
"Flash Drive (SSD)"
],
"Optical Zoom": [
"10x"
]
},
"brand": "GoPro",
"mpn": "CHDHX-401",
"imageUrls": [
"https://coolbackgrounds.io/images/backgrounds/white/pure-white-background-85a2a7fd.jpg"
]
}
}
How should I configure the Content-Language header value in powerautomate?
Thank you in advance.