What io-tags do you expect? 

Manuals and examples for the module. 

Once you define the input start .. stop in the hardware configuration, download hardware configuration to the PLC (while offline), you can then create or define Input tags for your TM module.

CollabSensei

I have configured the module for 16 outputs, but it doesn't seem to matter which setting I use for inputs vs. outputs. However, I am not getting any io-tags. I am using v19 update 3.

CollabSensei

I have configured the module for 16 outputs, but it doesn't seem to matter which setting I use for inputs vs. outputs. However, I am not getting any io-tags. I am using v19 update 3.

Unfortunately the tags are not automatically generated. Refer to the links that @Jacek offered. Also have a look at the following library:
Libraries of PLC data types (LPD) for STEP 7 (TIA Portal) and SIMATIC S7-1200 / S7-1500