Projects API Scripting to add followers to tasks

I've written a script that looks like it works, except it doesn't. The Python script does the following, but I've left out token refreshes and pauses that exist in the script:

Queries our company account and returns an enumerated list of all active projects and project IDs.
Prompts user to enter the number of the project they'd like to add followers.
Queries the project for tasks and subtasks, printed "This project has XX tasks" and prints an enumerated list of users and User IDs.
Prompts user to enter the number user(s) you would like to add as a follower to all tasks and enter 0 to finish adding users.
Adds users and echoes success or failure. See example below:

Retrieving access token...

Access token from tokens.json: 1000.aNOTTHEREALTOKENHERE123216546546546546461

Access token retrieved successfully.

Attempting to add user 123456789 to task 12345647890123456789. Status code: 200

Successfully added user 123456789 to task 12345647890123456789

Attempting to add user 234567890 to task 12345647890123456789. Status code: 200

Successfully added user 234567890 to task 12345647890123456789

Attempting to add user 345678901 to task 12345647890123456789. Status code: 200

Successfully added user 345678901 to task 12345647890123456789

Retrieving access token...

Access token from tokens.json: 1000.aNOTTHEREALTOKENHERE123123123123123123

Access token retrieved successfully.

Attempting to add user 123456789 to task 23456478901234567890. Status code: 200

Successfully added user 123456789 to task 23456478901234567890

Attempting to add user 234567890 to task 23456478901234567890. Status code: 200

Successfully added user 234567890 to task 23456478901234567890

Attempting to add user 345678901 to task 23456478901234567890. Status code: 200

Successfully added user 345678901 to task 23456478901234567890

Done adding followers to all tasks

According to the script, everything is peachy, but when I look at the project through the GUI, there's no change made.
Any idea what might be causing me this issue? It definitely returns my projects and users, and acts like it successfully adds follower.

Is this the correct string to add a follower to a task?

follow_user(task_id, project_id, user_id_1, headers)

Where else might I be going wrong here? Thanks for any help. I'm trying it again in PHP, FWIW...

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