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.

How do you turn off this ‘tracking control for ICSx5’?

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where did you find this option ?

I have Tracking Control installed and it blocked some of the essential trackers, in this case those of Google.