Cause
Low disk space is preventing the tabadmincontroller process from running.
The tsm.log located in C:\Users\<user>\.tableau\tsm where <user> is the TSM user running the tsm commands will show the following:
2021-12-05 10:33:09 main : DEBUG com.tableausoftware.tabadmin.TSMErrorHandler - TabadminController did not return a TsmResponse.
2021-12-05 10:33:09 main : DEBUG com.tableausoftware.tabadmin.TSMErrorHandler - Could not read document: Can not instantiate value of type [simple type, class com.tableausoftware.tabadmin.webapp.viewmodels.ErrorType] from String value ('Internal Server Error'); no single-String constructor/factory method
Or
2021-04-17 07:40:18 main : DEBUG com.tableausoftware.tabadmin.TSMErrorHandler - TabadminController did not return a TsmResponse.
2021-04-17 07:40:18 main : DEBUG com.tableausoftware.tabadmin.TSMErrorHandler - Could not read document: No content to map due to end-of-input