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Dear srjacob
Really appreciate your reply again and thank for your effort to share the latest situation to us.
Per your description, since you have processed all the possible reason to troubleshoot the reason, but the sync error still [persists, and it only happened in your phone and tablet. In this scenario, to confirm if the situation is related to the local environment or the tenant account. We recommend you directly contact your Microsoft 365 administrator to create a support ticket from Microsoft 365 Admin Center > Support > New service request. The support team over there has higher permission than us, they can involve more resource and investigate the behavior from back end as fast as possible. They also can check the behavior on your end remotely. For reference: Get support - Microsoft 365 admin | Microsoft Docs, you can select online support or phone support to have a live chat with the support engineers. This is the most efficient way for handling this case as per the situation. I am sure that our Expert Engineers from that side can address this issue effectively and accurately.
About how to find the admin in your organization, you can refer to How do I find my Office 365 admin
Really appreciate your patience and understanding again!
Sincerely,
Stacey | Microsoft Community Moderator