I have google sso for my website, When i post a link to my website on Instagram stories and when users open that link in instagram in built browser (not chrome or safari or others) they get the below error
One option is to use javascript to inspect the user agent hoping that the in app browser is using one of the well known in app browsers user agents.
With this information you can conditionally show a message to ask the user to open the page in a normal browser and prevent the signig workflow.
Have a look to this code.