Wi-Fi connection mysteriously doesn't work with some routers

I run Debian 11 with the LXQt desktop environment. I have noted that Wi-Fi works with some routers but not with others. I also have the same software setup on a different computer and it has the same problem with the same routers. My conclusion is that it must be related to connman which is the default network manager in LXQt. The two routers I'm having problem with is an Apple Airport Express and my iPhone (used as personal hotspot). In the Connman window it says that I'm connected but still I have no internet access (see pictures below). I have also tried the command line: $ connmanctl Error getting VPN connections: The name net.connman.vpn was not provided by any .sconnmanctl> agent on Agent registered connmanctl> scan wifi Scan completed for wifi connmanctl> services [snip] *Ac iPhone wifi_d03c1f255599_6950686f6e65_managed_psk [snip] connmanctl> connect wifi_d03c1f255599_6950686f6e65_managed_psk Connected wifi_d03c1f255599_6950686f6e65_managed_psk connmanctl> quit $ ping www.google.com ping: www.google.com: Temporary failure in name resolution How can I troubleshoot the issue? What should I check next?