I cannot connect to any online server

What kind of "server" are you trying to connect to (featured, realm, bds, shared world)?
Are you able to access other online features (Marketplace, etc)?

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Hi,the kind of server is bds i think,when i friend join i cant join them or neither they can.

Also,yes i can acces other online features.

This is happening to me and my friends as well as 100s of other people on twitter. (all of us on playstation). there is currently issues with the playstation servers when trying to join friends worlds. please get this fixed soon asap as it’s been days. 

I play on Windows PC, but can confirm that it won't let my friend join my worlds (they're also on pc). If you're on Windows 10 PC, try inviting your friend via "Invite To Game" in the Game menu. Ask your friend to open Xbox Game Bar. I think the invite should pop up in Xbox Social, in the Notifications part. (Hint: it looks like a bell, if you have a circle with a number in it it means you have a notification. Or at least i think, it's been a long time since i last got a notification.)

If you invite your friend on Xbox, then they should get a notification at the bottom middle of the screen, saying [Username] Invited you to join their game

or at least i think so. press and hold the (X) Xbox button on the controller to accept it.

However, I do not know how to fix it for Playstation users, for i only have this game on the following:
Windows 10 PC [RTX]
Xbox Series X
Nintendo Switch

I think this means that the problem is "Partially Resolved"..?   

By the way, if it says Invite to game on the game menu in-world on ps4/ps5, try doing that, i think there will be a notification on the top right/left of your friend's screen. that should fix it.

Make sure that they dont have Do not Disturb on

Have you tried the idea from the last comment provided for you? Did it fix your issue?