@Faya,
I have the same issue.
Since today I receive this error message.
Your Steam name - S@msung (Playing Steam PC)
A picture of the error that you're are getting - see below
Are you running any UDP telemetry tools? NO
Validating F1 2019 was successful but did not solve this issue!
UPDATE:
After second time Validating F1 2019, it was possible to play online again. So my issue is fixed.