If you received the error AADSTS90033 while trying to access then just check your Service Health Dashboard you should see incident MO222965 saying,
Starting at Monday, September 28, 2020, at 9:25 PM UTC: Users may be unable to access multiple Microsoft 365 services. More info: Users would be unable to access Outlook.com, Microsoft Teams including Teams Live Events, and Office.com. Additionally, Power Platform and Dynamics365 properties are affected by this incident
You can also check https://status.office365.com/ or any ongoing issues with Microsoft Office 365 related outages or issues.

AADSTS90033- A transient error has occurred. Please try again
Comments:
- Working now, looks resolved by Microsoft.
14 Dec 2020 09:50:15 GMT
- This is fixed for Norway it looks like.
14 Dec 2020 09:23:05 GMT
- Getting this error message when trying to access anything from Office 365 "Our services aren't available right now. We're working to resolve all services as soon as possible. Please check back soon."
14 Dec 2020 09:13:34 GMT
- We're getting a "AADSTS90033: A transient error has occurred. Please try again." on several tenants in Region EU.
14 Dec 2020 09:11:15 GMT
- Many of the tenants I manage are experience this error when trying to login the web apps, admin centres and so on.
14 Dec 2020 09:06:12 GMT
- Azure AD login is giving this error.
14 Dec 2020 09:05:44 GMT
- Same issue here (Germany). Can't log in to Teams on my company account. Get this message even before the corporate login field:
14 Dec 2020 09:00:23 GMT
- try to log to my account and I have this error "AADSTS90033: A transient error has occurred. Please try again.", do you have any issue right now?
14 Dec 2020 08:58:54 GMT
- Is this why I get the message "AADSTS90033: A transient error has occurred. Please try again." ?
14 Dec 2020 08:58:01 GMT
- Outlook on iPhone not working.
14 Dec 2020 08:50:22 GMT
- Yes this is a know issue, many are facing this issue while accessing office.
01 Oct 2020 16:10:15 GMT
- Further comments disabled!
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