Note: Be weary of rigs who state they only work with a specific pool.

antKS5 with flashed eeprom.
There are definitely problems with 2miners! (didn't work via mrr, "stock/flashed" is the same; because the pool itself doesn't support these devices; and after this pool the device starts to behave unstable!)
Most likely solopool, kaspa-pool, herominers, woolypooly, arcadoom, mynewmining, gogpool, tazmining don't work too.

Viabtc, baikalmine - they seem to be working.
Viabtc definitely works, of course, if you don't run it after 2miners, or similar pools that don't support KS5 at all.
In k1pool via MRR only port diff=8192(35184908967936) work: eu.kaspa.k1pool.com:23122 or eu.kaspasolo.k1pool.com:23124 for solo.

upd: since they added eu2, the K1 pool is not working properly (and there is no more support for the EU-01 server (Amsterdam; I mean normally) on MRR due to overload or something - that's what the admins said, that need to use other servers) --- also, when I checked, it turns out it's only happening with the solo server .. so .. please use (for solo) on K1 pool EU02 severs and with same diff (I haven't checked the others yet)
upd2: on K1 pool (for solo, EU02) diff=16384(70369817935872) also works