Some apps and devices don’t work on my WI-FI

Some apps don't work, as they should on my wifi. All websites work fine.

THE PROBLEM:

1.[android] Alexa just does not pair. Tried almost everything, from resetting Alexa, to resetting the router. Yes it works on other networks, and every problem mentioned here work perfectly fine on the other network so I wont repeat it.

2.[android] Live Matches on JioHotstar (disney+ in my country) do not load, they're always stuck on buffering. Other movies and shows work. Its just the Live Feed of any match, ON THE APP. On the browser it works fine. Matches load normally. No buffering issues, nothing. Just the APP.

3.[Windows 10/11] Microsoft store does not load. It keeps on buffering, and then shows the refresh page option. Again, the website works, and it works fine on other network.

4.[Windows 10/11] I cannot play GTA ONLINE because it does not connect to internet. I have to play story mode, which btw I have completed 4 times (no one asked).

WHAT I HAVE TRIED:

1. Rebooting, Resetting the router a couple dozen times.

2. Changing the router

3. Changing DNS

4. Changing gateway and etcetera

SOME IMPORTANT INFO

The Wireless connection works on a dynamic ip. Some people from GTAO subreddit told me to keep the router of for a day or two, to change the Public IP. The IP DID NOT change. The IP has been same for >2 years. As mentioned, I have tried the basics, like rebooting or resetting the router more than 20 times each.

NOW WHAT COULD BE THE GODDAMN ISSUE