O365 Public Folders - Only anonymous access is working for some users though they are domain users

Hello Gopinath Ganesan,

I am not sure the exact attribute that could be causing this for you, but I have a suggestion for how you could try to troubleshoot it. Hopefully someone comes along that can give you a more specific approach, but I had a problem with PF's after migration from 2010 to O365 (all be it a specific permission one, not anonymous vs default.) We tried all the logging we could think of etc, and in the end followed the below steps which ultimately resolved the problem.

1. Create a test PF in O365, and mirror the permissions you are seaking there for a few test users. 
- If this works as intended, do a PS dump of all attributes from that PF as well as one of the ones you are having issues with.

Get-PublicFolderClientPermission is where I would start. I would also probably do Get-PublicFolder, Get-MailPublicFolder

Put the exports into a CSV file, and combine the two, that way you have a direct line by line comparison to see if anything jumps out at you as wrong.
*This step solved our issue for ALMOST all of the PF's, we only had one it did not for. We had a few settings wrong that once adjusted fixed the behavior for most of them.

- If your test PF does not work, I would guess you have some organizational configurations off, so take your exploration there.

2. If your test box works, but no setting looks off, think about migrating the content. We had to do this for one of the boxes we could not figure out. I simply loaded up an outlook client on night with a profile that had permissions, did a PST export, then PST import outside of business hours, then in the morning, moved the mailbox name/SMTP address/etc to the new box. (this involved deleting the old box).

I realize its not ideal, but the steps above should resolve your issue, it is just more of the shotgun approach rather than a tactical strike. 

Hopefully someone comes up with something a bit more direct, but in lue of that, the above should work. 

Goodluck!
Adam