Unable to add existing list to Lists in Teams channel

[JWhiteFEI]

I am having an issue adding an existing list to Lists in Teams. I can add all other lists from this group/site to the desired Teams channel, except this one. I am getting an error: "That link did not work because you either do not have access or it is unsupported."

The channel is private and the list is not hosted on the sub-site for the private channel; rather its hosted on the main site. However, I was able to add other Lists from other sites to this private channel with no issue.

I have verified that the permissions are standard; same as all the other lists. I am an owner with Full Control. I can access and edit the list through SharePoint no problem. Any ideas as to why this may be happening?

[#2]

@JWhiteFEI 

We have the exact same issues:

#Microsoft lists
#Microsoft Teams
#Microsoft SharePoint

[#3]

@JWhiteFEI 

We have the same issues, but it is every sharepoint site. Hopefully MS fixes soon so you can use existing from non-group based SP sites and not just ones created from the app or group based.