In case it's a transient backend issue, could you have a try again and see how it goes?
If the error persists, please have a look at the Service Health dashboard via Microsoft 365 admin center (How to check service health) and check if there's any potentially relevant active issue in your tenant.
If there are still no findings, I'd recommend opening a Support ticket to directly report this issue.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.