Dynamics 365 Remote Assist is a cloud-based service. It must need the Internet.
As we are mainly responsible for general issue of Microsoft Teams, your question which is involved in Dynamics 365 Remote Assist is not included in Teams.
Dynamics 365 Remote Assist is currently not supported in the Q&A forums, the supported products are listed over here: https://learn.microsoft.com/en-us/answers/products (more to be added later on). I would remove the office-teams-windows-itpro tag and add the not-supported tag.
For the related questions about Dynamics 365 Remote Assist, you can ask in here.
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