By default the game only allows either PC, or mobile players to connect to a server. To work around this limitation, you can use the Crossplay  TShock plugin.

To install it, first get the current version of your server by using the /version command in the ‘Console’ tab of the ATBP panel . The output lists both your Terraria version and your TShock version.

Then, head over to the releases  page of TShock and find the release that matches your server’s TShock version. The release notes list the Terraria version each release supports.

Now, using the Terraria version (1.4.4.9 in our case), head over to the releases  page of the Crossplay plugin, and find the compatible version for your server.

Once found, download the Crossplay.dll asset.

Finally, please follow the steps to install the Crossplay plugin.