If we understand you correctly your Tablet and laptop which are both Roon Remotes are connected to the same Mesh network and only laptop can connect normally.
Considering this we would like to ask you for foloowing:
can you share with us a screenshot of the issue from your Tablet.
Many Roon users with Deco mesh networks find that device discovery performs better if you have set the nodes to Access Point mode.
Usually you can perform this step in the Deco app itself or in the router settings admin page. Here are instructions from TP-Link:
This prevents the mesh nodes from forming separate subnets, ensuring that device discovery announcements from RoonServer and Roon Remotes can reach one another.
We haven’t seen a new post on this thread from you and our diagnostics servers don’t show any activity on the Android tablet you mentioned.
We’re eager to ensure you’re equipped for success. Please let us know when you have a chance to try the steps in the post above and we’re happy to clarify any details.
This thread is now automatically closing due to inactivity. We’re going to assume this issue was resolved independently. If you wish to continue troubleshooting, you can reactivate the conversation by opening a new support thread, selecting “other,” and referencing this thread URL.
We’ll pick up the case from there. Otherwise, happy listening. Thanks!