I put my issue of not being able to log into my OSM account through my Organic Maps app in their telegram group, and there I was told about the oauth by OSM. What is that and how to get it ?
It is using your OSM account to login to Organic Maps.
And it looks like you already have it. If this, CartyDirty | OpenStreetMap is you
See also:
Just in case you haven’t noticed, community.openstreetmap.org isn’t a chatbot, it is real people spending their time trying to help you, but you need to uphold your side of the deal, that is: use google etc and wiki.openstreetmap.org to try and inform yourself. If you get stuck after trying that, then asking a question here is appropriate.