Hi ​@Hampusgreen, it would help to know how / from which device/service you're trying to sync the activities. Based on these details, someone familiar with your setup can advise further.

I did the activity on Zwift, so from there. The activity is now showed on both Zwift, companion app, wahoo, Garmin but not strava. Activity was recorded on Oneplus if that matters

ok for Zwift, general help article is here:

 https://support.strava.com/hc/en-us/articles/216918677-Zwift-and-Strava

If it doesn't help, please reply which exact step fails, whether you are getting some error etc.