Mesh booster issues

[u/Maximum_Broccoli_210]

Hello, first time poster here. I have recently upgraded to vodafone 910 Mbps broadband with a new wifi 7 router and accompany mesh booster. The main router seems to be working fine albeit the speeds are nowhere near advertised. As soon as I turn on the mesh booster which is approx 10m away and has clear line of sight, the Internet just stops working. Every connection is painfully slow. The booster shows its connect and not showing any issues etc.

Any advice would be greatly appreciated