

OP, how old is the phone / what version of android is it running?
Just tested this on my s24u, connected to wifi with no physical SIM and my eSIM turned off I can still turn on mobile Hotspot. Seems weird that you can’t especially since iirc Samsung let’s you share your wifi connection through Hotspot as well.
Edit: goto settings>connections>mobile Hotspot and tehtering>mobile hotspot> click on the network name field. You’ll be taken to a screen to change the name but at the bottom there’s an advanced button. Click that and near or at the bottom will be “wifi sharing” turn that on and you can share your wifi connection through hotspot.
For me it’s because I’ve been drinking carbonated drinks for so long that flat water is awful to drink. I know it’s good for me, I know I need to stop the carb drinks. I know I’ll live a longer life if I do this. But it’s somewhat like an addiction for me, it’s really hard to quit and move to water.
The tap water in my area tastes pretty gross. I’ve tried the flavored water and never really found one that was good and didn’t have weird taste or drinking effects. I would do carb water but it’s so expensive, more expensive than my carb drinks now. So it’s hard to even find a replacement.