After creating an account in O365, the user cannot access Outlook Online, cannot configure local Outlook, mobile Outlook. And also can't connect to his mailbox via the IMAP protocol. 
I also observe a problem with deleting users. After revoking the user's license and deleting it via admin.microsoft.com, the user disappears in Azure AD but remains visible in admin.exchange.microsoft.com . Even after forcibly deleting a user in Azure AD. 
If I try to delete a user through Exchange Online PowerShell, I get the following error 
PS /Users/redhat> Remove-Mailbox -Identity Removed for privacy 
Confirm 
Are you sure you want to perform this action? 
Удаление удостоверения почтового ящика: Removed for privacy Пометка почтового ящика и архива (при наличии) для удаления. Связанная Windows Live ID Removed for privacy 
также будет удалена и не будет доступна для другой службы Windows Live. 
[Y] Yes [A] Yes to All [N] No [L] No to All [?] Help (default is "Y"): A 
Remove-Mailbox: An Azure Active Directory call was made to keep object in sync between Azure Active Directory and Exchange Online. However, it failed. Detailed error message: 
Resource 'bbaa929e-1ec2-4c53-bd92-3e089b7be55a' does not exist or one of its queried reference-property objects are not present. DualWrite (Graph) RequestId: ff363740-c192-4a88-823a-506173a508a8 
The issue may be transient and please retry a couple of minutes later. If issue persists, please see exception members for more information. 
Also when the command "PS /Users/redhat> Get-Recipient Removed for privacy | fl" 
In the output I see "OrganizationalUnitRoot: Removed for privacy ", although we previously added a new domain Removed for privacy , and the previous domain was deleted. Removed for privacy 
this happens to all newly created users. 
We have only cloud infrastructure, non-hybrid
When trying to log in as a new user in Outlook Online, we get the following error 
X-ClientId: 8FA2E7382F1545D8BCA3C880547323C7 
request-id 2ffed42a-b746-96d5-1011-e7ef9b1f5561 
X-OWA-Error Microsoft.Exchange.Data.Storage.DatabaseNotFoundException 
X-OWA-Version 15.20.4951.12 
X-FEServer FR3P281CA0054 
X-BEServer PAXP193MB2027 
Date:2/4/2022 8:57:13 AM 
InnerException: TWljcm9zb2Z0LkV4Y2hhbmdlLkRhdGEuU3RvcmFnZS5EYXRhYmFzZU5vdEZvdW5k 
RXhjZXB0aW9u (Base64)
Microsoft Exchange Online: A Microsoft email and calendaring hosted service. Management: The act or process of organizing, handling, directing or controlling something.