Multiple licences on one account

[Virage Sonore]

I have questions about multiple licences on one account.
Hello !
I have a computer at the studio and my laptop. Up until last month, I had two licences : one normal subscription and one student subscription (bought back when I was still a student). Always been working with no problems, I sometimes have people working at the studio while I work on my laptop.
Last month, my student status was to be renewed and so I bought a perpetual licence. Since then, I can't have the two computers working together...
I don't even know which licence I'm working with anymore... I don't know where to check, is it Avid Link or is it iLok Licence Manager ?
The two licences are on the same Avid account and the same iLok account. It was the same thing a month ago when the two computers were working fine at the same time... so I don't understand.
On iLok Licence Manager, I try to activate the new subscription and it asks for a USB iLok ??????? How ? It's 2024, and before, it was all good and I didn't need the USB iLok...
What is going on ??!!!
HELP ! It's so complicated for nothing.