Two Domains, 2 accounts, 2 tunnels, 2 Websites. 1 Raspberry Pi.

I am running a stack in Docker on a Pi5
MariaDB
Apache: 2 websites
php
OwnCloud
CertBot
Tunnel1: Website 1
Tunnel2: Website 2

The reason for the 2 tunnels is I don't own the second URL. That is in the account of the person I host the website for.

My own website (which is on Tunnel 1) is working,
The other one, which is ofcourse on Tunnel 2.
Is working intermittently.

Now, I don't have direct access to the account that holds Tunnel2. So troubleshooting is troublesome.
But hoping it's not the issue where the Tunnels kind of collide.
Would/could this be solved by placing Tunnel2 and Website2 on a separate Pi5?
Or is this something else entirely?
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