What kind of halo is this?
So it looks something like this? https://cloud.planetmaker.de/index.php/s/RkmkBNfb8YyDHSE

That sounds like the circum-horizontal ring (yes a name as simple as that). It (probably) is caused by hexagonal ice crystals floating horizontally. Where it touches the 22° halo you might see sun dogs which can be slightly colourful brighter patches.

See also https://www.meteoros.de/themen/halos/haloarten/ (German) and http://www.atoptics.co.uk/halosim.htm