Office 365: MigrationPermanentException: Error: MapiExceptionAmbiguousAlias: Unable to synchronize manifest

Problem

Sometimes when performing Remote Move mailboxes from Exchange 2007 to Office 365 (using Exchange 2013 Hybrid server as proxy) you may face following error:

Error: MigrationMRSPermanentException: Error: MapiExceptionAmbiguousAlias: Unable to synchronize manifest. ‎(hr=0x80004005, ec=2202)‎ Diagnostic context: ...... Lid: 52176 ClientVersion: 15.0.1104.8 Lid: 50032 ServerVersion: 8.3.389.2 Lid: 23226 --- ROP Parse Start --- Lid: 27962 ROP: ropOpenFolder [2] Lid: 27962 ROP: ropIncrCfg [112] Lid: 27962 ROP: ropUpldStStrmBegin [117] Lid: 27962 ROP: ropUpldStStrmEnd [119] Lid: 27962 ROP: ropUpldStStrmBegin [117] Lid: 27962 ROP: ropUpldStStrmEnd [119] Lid: 27962  ROP: ropUpldStStrmBegin [117] Lid: 27962 ROP: ropUpldStStrmEnd [119] Lid: 27962 ROP: ropUpldStStrmBegin [117] Lid: 27962 ROP: ropUpldStStrmEnd  [119] Lid: 27962 ROP: ropFXSrcGetBufferEx [156] Lid: 17082 ROP Error: 0x89A Lid: 23137 Lid: 21921 StoreEc: 0x89A Lid: 27962 ROP:  ropExtendedError [250] Lid: 1494 ---- Remote Context Beg ---- 

Move request for the mailbox is failing and if you restart the move, same error appears again.
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Office 365: Error 500: Unable to convert regular mailbox to shared mailbox

Sometimes when you trying to convert Shared mailbox to Regular mailbox or vice versa on your Office 365 tenant you may face following error: (actually you may face the error when performing any type of mailbox conversions):

Error on proxy command 'Set-Mailbox -type: 'Shared' -Identity: 'your_alias' -Confirm:$False -Force:$True' to server DBXPR04MB205.eurprd04.prod.outlook.com: Sever version 1941996320, Proxy method PSWS: Request return error with the following error message:
The remote server returned an error: (500)
Internal Servicer Error...
+CategoryInfo :NotSpecified: (:)
[Set-Mailbox], CmdletProxyException
+FullyQualifiedErrorID : Microsoft.Exchange.Configuration.CmdletProxyException,Microsoft.Exchange.Management.RecipientTasks.SetMailbox
+PSComputerName : pod51000psh.outlook.com

It seems to be internal Office 365 issue and there is no other solution other than give Microsoft a call, but in case you need convert mailboxes urgently, you may want to use following workaround:
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Office 365: 403 Sorry! Access denied

Problem

User receiving following error when trying to access Options from OWA in his Office 365 mailbox:

403

 Sorry! Access denied :(

 You don't have permission to open this page. If you're a new user or were recently assigned credentials, please wait 15 minutes and try again.

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 more info  

 Email address:
 your@email.com
 Correlation ID:

 Client Access server name:
 xxxxx02MB045.namprd02.prod.outlook.com
 Client Access server version:
 15.0.810.5
 Time (UTC):
 2000-10-02T11:23:47.5909377Z

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Office 365: ‘Subtask ValidateConfiguration execution failed: Configure Mail Flow’

Problem

When executing Hybrid Configuration Wizard you may receive plenty of different error messages related to any part of the process. One of the errors I have seen quite often is “Configure Mail Flow” error which happening on ‘Get-HybridMailflow’ command. It looking like:

[1/11/2000 18:16:56] ERROR:Updating hybrid configuration failed with error 'Subtask ValidateConfiguration execution failed: Configure Mail Flow
  at Microsoft.Exchange.Management.Hybrid.Engine.ExecuteTask(ITask taskBase, ITaskContext taskContext)
Additional troubleshooting information is available in the Update-HybridConfiguration log file located at C:\Program Files\Microsoft\Exchange Server\V14\Logging\Update-HybridConfiguration\HybridConfiguration_date_logfile.log.

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