I activated my no. for Astro Hotstar when it was rolled out last year. Then, at the same time, I have UniFi Ultimate Pack, which grants me a free Hotstar account. Last month, I already activated via UniFi, and instead of using my no. to activate for UniFi, I used my sister's no. I got an SMS after that it was successful but without mentioning it is for which no., I assumed it was for my sister's no. which I used for activation.
This morning, I received an SMS from UniFi that it is ready to use under my no.

Now my Hotstar shows two sets of accounts (I think?).
Subscribed to Disney+ Hotstar Yearly
Subscription valid till: 31 May 2022
Subscription to Disney+ Hotstar 2 Years
Subscription valid till: 17 May 2024
How does this work now? I'm concerned about the no. of devices that can be connected at the same time...
Thanks for the info. I also have Astro Hotstar under the same number that's on record for my Unifi account. I was planning to do the same as you, activating Unifi Hotstar with a different number. Looks like that's not going to work.
I suppose changing the number that's on Unifi's record to a different number before activating Unifi Hotstar could work. But bet it will mess something up.