Hi there, welcome!
Please check if it helps configuring the file according to this:
https://man.archlinux.org/man/connman-service.config.5
E.g. from the Examples:
[service_home_wifi]
Type = wifi
Name = my_home_wifi
Passphrase = password
IPv4 = 192.168.2.2/255.255.255.0/192.168.2.1
MAC = 06:05:04:03:02:01
Please provide also your system specs, with the outcomes of:
inxi -Fza
with 3 ~ before and after the text (for formatting reasons)