Other

Team reach is an app for Android but has no web interface.

Install it under Bluestacks and join groups via the "Codes ToDo" sheet of "PickleballDiscountCodes.com - submission log" - https://docs.google.com/spreadsheets/d/1LK9i5YaQHvZaXESHFSakTmCCLt01x7sxO94XNtodX8s/edit?gid=1266331797#gid=1266331797

If you can automate that using TinyTask we will hire a human to post messages.

Join a group.
Groups to be joined are currently in the "Codes To Add" column C of the "Codes ToDo" sheet.

There will be some empty cells in that column; candidate codes in column A are copied to column B ("Already Added") if they already exist in column A of "Codes Done".
So we might need to copy column C ("Codes To Add") to a text file and remove blank lines if we are using TinyTask.

To join a group:
- paste the code into the Group Code field.
- click '+'
- click Join Group

Most groups grant immediate access, a few require administrative approval.

Hilarious: I picked "fred" out of the air as a likely name of some team reach group so I could see the flow and it turned out that it was Sporting Club Pickleball!

Assume that you were granted immediate approval and click OK.
Since there is no search mechanism by group code and no way to copy the group name from the Success screen, I see no way to open the new group (hoping to get the number of members and post a message.