I am trying to generate ClientID and Secret in one of the SharePoint Portal using the _layouts/15/appregnew.aspx url. But all the time while submitting it provides error such as "Something went wrong".
Thanks in advance!
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You may need to enable ACS app-only access token:
"For new tenants, apps using an ACS app-only access token is disabled by default. We recommend using the Azure AD app-only model which is modern and more secure. But you can change the behavior by running ‘set-spotenant -DisableCustomAppAuthentication $false' (needs the latest SharePoint admin PowerShell)."