Public google calendar does not sync with phone

I have imported a public google calendar to my /e/ account and it correctly syncs with my Thunderbird. However, it does not sync with my phone (Galaxy S7 oreo). I receive a timed-out error.
I have an other public calendar set up in a similar way, and that syncs correctly with the phone.

Any suggestions how to fix this issue?

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

I have figured out myself.

I had to turn off Tracking Control for ICSx5 (not to block in the Essential section), and it works.