Minecraft Realms issue

Every time I try to connect to my friend’s realm I get disconnected 6 seconds later. I tried realms trial on my own same story.

Things I did: disabled proxy, set static ip, set firewall exemptions, set firewall inbound rules, allowed java in firewall, reinstalled Minecraft no mods or shaders just vanilla, set DNS to google public DNS, turned off AV and Firewall completely.

I can connect to Hypixel server and literally play on that server without getting kicked. I have no idea why Realms is not working. My other friends can connect without issues.

Things I haven’t tried yet: Portforwarding.

I have no idea how to do this. Also, my ISP has locked the advanced settings on my router.

Any suggestions are welcome.