Question Using GitHub Actions to build & test Unity project

Hello!
I'm trying to setup a system where I can automatically build&test my project when pulling on GitHub.
I'm using GameCi (https://game.ci/docs/github/getting-started) but I ran into some problems with the license verification. I tried both the manual files activation with a Personal license and using my Pro key (from the student plan) but neither worked.
Has anyone managed to set up a system like this with unity?

Here are some of the errors I'm getting:

Code (csharp):

1. LICENSE SYSTEM [2021211 10:38:54] Headers:
2.     HTTP/1.1 500 Internal Server Error
3.     Reason: Internal Server Error
4.     Vary: Accept-Encoding
5.     Content-Encoding: deflate
6.     sc-token-expires-in: 7198
7.     Cache-Control: no-cache, no-store, must-revalidate
8.     Pragma: no-cache
9.     Expires: 0
10.     sc-request-id: 44e3330f-863a-4d00-9dce-1ca1f1a53a04
11.     Content-Type: text/html
12.     Contnt-Length: 29

Code (csharp):

1. LICENSE SYSTEM [2021211 10:38:54] Error fetching https://license.unity3d.com/update/poll?cmd=9&tx_id=af0959851efa814b2b4fcbe0cfb15878&(serial removed)
2. Cancelling DisplayDialog: Information There was a problem communicating with the license server. Would you like to do a manual activation instead?
3. This should not be called in batch mode.
4.  
5. (Filename: ./Editor/Platform/Linux/EditorUtility.cpp Line: 274)
6.  
7. Unclassified error occured while trying to activate license.