Problem with cf tunnel on specific domain

Each time I try surf my main domain behind cf tunnel, I get error 403 forbidden and when I change to different domain all working as expected.

Does this service works with customer root certificate like Letsencrypt?
All the other domains I own configured to your default SSL vendor and using only with universal SSL.

Show us the screenshot of the Error 403.

This is the error

I see there is no answer at all from Cloudflare not via Support and not here in the forum.
Disappointed lack of support to pro customer.

I’ll consider cancelling and leave Cloudflare.

Till now this is the worst support I have ever encountered.

Ticket no. 2739694

Resolved in the CF Developer Discord by disabling Railgun on the affected subdomain.