ERROR code: 0x80070185

You might be on to something though, gonna test out some theories about migrations.  I have a library that has the issue and if I create a new file in that library using the New Dropdown from the browser, that new file will open fine from the sync'd OneDrive library.  I can copy a file via drag drop from a shared network drive to the library via browser and that file also opens fine when opened from the sync'd OneDrive folder.

I am curious if anyone sees this error in libraries that were not migrated and do not contain any migrated files.

Right now, it seems as though most people are only seeing this in libraries that were migrated.

By PC I meant in general terms the computer, we have no Macs so can't speak to that.  Some of the libraries that have the problem have been migrated using a tool called File Facets.  However other libraries that have also been migrated using this tool are fine.  It doesnt seem to be related to a specific library however, I have the issue with Library A and other users have no problems with Library A.  They have an issue with Library B and I have no issues with Library B.  Unless it is even intermittent between libraries I havent been able to determine that.

It is also happening to Mac users, so it isn't just relegated to PCs.

The intermittent nature of this error makes it difficult to pinpoint the actual cause.

In our case, all of the affected libraries contain files that were migrated to SharePoint from a file share.

Do your affected libraries contain folders/files that were migrated to SharePoint from somewhere else?

We are having the same issue here is our findings.  No resolution.

• We have the problem on libraries with less than 100 documents in it as well as larger ones so no correlation to the 5000 list view threshold.
• It only effects office documents, pdf files and other files like images open fine.
• Clicking Try Again or Skip seems to then allow you to open the file.
• Once the file has been opened the issue seems to go away for that particular file, even if right clicking and telling to to Free up Space.
• Users with this problem also report other issues with syncing that may be related to this issue. They will open certain files and it will say that it cannot upload because the path is invalid, when this occurs you can see files in the office upload center in an error state.
• I have validated that it is not an issue with https proxy traffic decryption by removing my PC from our proxy tunnel and going direct to the internet and still had the issue.
• Reboots, unlink account, uninstall / reinstall, none of these will fix the issue.  It seems somewhere deep in the OS something is hung with particular libraries for users.
• I cannot narrow it down to any particular library, some users have a problem with one library that other users have no issues with.  I can't seem to find a way to always replicate it.  I just know that once the machine seems to have a problem with a library it always has a problem with that library.
• I ruled out AV software by disabling it on my machine, still had the issue.
• I disabled bit-locker thinking it might be related to drive encryption, we had issues using Dell DDP with onedrive when we initially rolled out windows 10 and moved to BitLocker but that had no effect.
• I sync the drive from a different PC using my same credentials and the new PC doesnt have the issue.

This definitely seems to be PC related with the sync and not anything to do with the particular SP library or User Account.