Hi there,
Thanks for sharing the error ID. I checked back end logs and below is what we are getting -
"Error message returned by AMO search account api= 'Login does not have access to the Advertising Account'\"
Do check that you have enabled advertising Analytics at report suite level before creating the integration.
https://experienceleague.adobe.com/docs/analytics/integration/advertising-analytics/advertising-anal...
Secondly, please check if you have access to the report suite for which Advertising Analytics account is created.
If this does not help, I think further investigation might require at client care's end.