Maintain the mouse left click and open the link in another tab of your browser.It looks like you have trouble connecting to the notification service. Please go to https://boardgamearena.com/troubleshoot to the end (step 3) and file a support ticket by going to the support page. But first, please try the following and check what resolves your issue:
* try from a different device (PC, phone)
* try with different network settings: wifi, network cable or 4G/5G
* try with your VPN on or off if any
* disable firewall/anti-virus if any
Go there https://boardgamearena.com/bug?id=227765 using this link in a new tab. The bug is confirmed.