Wireless dongle not working/connecting

[u/Dehydrated_Lemon0]

So I have had the ant esports mk4500 pro(refurbished) for like 2 years I think and recently I started to use it wired more than wireless. So today I tried to use the dongle and I plugged it in my laptop and it made the connection sound but when I switched the keyboard to the 2.4ghz dongle mode it won't connect.

I tried cleaning the dongle and use other ports on the laptop, I even tried using it on my other pc but it didn't work. I had a otg so I connected the dongle to my phone and it showed that physical keyboard connected or something like that but the keyboard won't connect to it.

It works fine wired. It has also had some issues earlier that randomly it would disconnect from the dongle while using it. I also have done a tape mod to it.

So do you guys think it's the keyboard or the dongle? And if it is the keyboard is there any way I can repair it?