https://us.community.samsung.com/t5/Galaxy-Watch/Error-code-4001-T-Mobile-Galaxy-Watch-6-Classic/m-p/2776539
Solved: Re: Error code 4001 T-Mobile Galaxy Watch 6 Classi... - Samsung Community - 2776521
Jan 11, 2024 - Ok the issue for me resolved after the above and then I "converted" my physical SIM to an eSim on my phone restarted my phone and - 2776521