We recommended that you contact your office 365 administrator to go to Office 365 Admin Center-> Support-> New Service Request, the support engineers there have the same environment to reproduce the issue, collect logs from your organization in order to find the cause and advise efficiently. This issue could be due to a configuration issue, permissions problem, or a synchronization error between the tenants.
If you are admin (if not kindly contact your admin or IT department ) You can refer to this article to check the way how to raise a ticket. Ways to contact support for business products - Admin help. The engineers in related team have higher permission and resources than us to help collect log and check the root cause directly.
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