Did you create a new npub?
You know you can use your nsec across all NOSTR apps?
I explain it here:
https://habla.news/u/mhardcastle@nostrplebs.com/1725913455892
Discussion
I did create a new npub. I'm abit para when I use a new platforms. First time I heard of 0xchat, seems pretty legit. Could add my original npub.