The redirect URL specified in the request does not match

  Issue

When you attempt to open an existing form or create a new one you receive a message similar to the following:

“Sorry, but we’re having trouble signing you in.”….

“The redirect URL specified in the request does not match the redirect URLS configured for the application”

  Resolution

The following command was provided by Microsoft and has resolved the issue for a number of customers.

Connect-AzureAD
$sharePointOnlineServicePrincipal = Get-AzureADServicePrincipal -Filter “appId eq ‘00000003-0000-0ff1-ce00-000000000000′”
$sharePointOnlineServicePrincipal.ReplyUrls.Add(“https://*.sharepoint.com/_forms/*”);
Set-AzureADServicePrincipal -ObjectId $sharePointOnlineServicePrincipal.ObjectId -ReplyUrls $sharePointOnlineServicePrincipal.ReplyUrls