Getting Unauthorised in the azure Portal

Hello,

I have an app that is using the graphAPI and was registered in the azure AD via the web portal. I need to update the secret and URL from this app, but every time I tried to access anything in the azure AD I get a "Authentication_Unauthorized" error. I'm logged in with the same user I configured the application, but I cannot access anything anymore. It seems to be related to the new UI but I think I cannot change back.

Here is the detailed error:

{ "shellProps": { "sessionId": "2e3692d1c6cd4620a0146472f56d9990", "extName": "Microsoft_AAD_IAM", "contentName": "EnterpriseApplicationsUserSettingsBlade", "code": 403 }, "error": { "message": "Graph call failed with httpCode=Forbidden, errorCode=Authentication_Unauthorized, errorMessage=User was not found., reason=Forbidden, correlationId = 8e2e5ef4-6114-4574-a6a2-fa94d611e002, response = {\"odata.error\":{\"code\":\"Authentication_Unauthorized\",\"message\":{\"lang\":\"en\",\"value\":\"User was not found.\"},\"requestId\":\"2a7dbab7-0fc6-4c53-821f-ab06d7590511\",\"date\":\"2019-11-01T14:00:58\"}}", "code": 403 }}

Is there any way to fix this?