OK, after many days trying it, I found the solution (for me at least) and it is very simple:

• Go to your phone's flow -> top-right menu (three dots) -> Settings
• Under "My Flow" select "Delete My Flow"
• Scan the QR Code again to connect. Voilà.

@Mixbox99 You're right, I just use 1 connection between my phone and computer. I thought all PC browsers connected to the same account (so not using the QR code) would share the same flow (?)...

@SonicWeaver

@nadie-nada-nunca Unfortunately, yes. But that's the only way I managed to make it work so far. A bummer, I know, but I couldn't find any other way to be able to use it back again.

@Mixbox99 Hmm... interesting... I'll try to add another PC to the flow and see what happens...

@Mixbox99 You're right, I just use 1 connection between my phone and computer. I thought all PC browsers connected to the same account (so not using the QR code) would share the same flow (?)...

OK, after many days trying it, I found the solution (for me at least) and it is very simple:

• Go to your phone's flow -> top-right menu (three dots) -> Settings
• Under "My Flow" select "Delete My Flow"
• Scan the QR Code again to connect. Voilà.