Hi,
When integrating D365 with Teams and using Graph (adding Dynamics 365 app as a tab on a channel in a team connected to D365) you need to provide a content url among others which is msteamstabintegration.dynamics.com
I have seen on some blog posts that "msteamstabintegration.crm.dynamics.com" (with the ".crm." is used as well) and wonder which address is valid and shall be used: msteamstabintegration.crm.dynamics.com OR msteamstabintegration.dynamics.com?
Looking the Power Platform Content Security then only the "https://msteamstabintegration.dynamics.com" is mentioned.