Likely you hit the rebind_protection if this doesn’t solve the problem already look at fritzbox topics - many discussions exist. 101: Split-Brain DNS (split-horizon) splitbraindns could help as well.
Likely you hit the rebind_protection if this doesn’t solve the problem already look at fritzbox topics - many discussions exist. 101: Split-Brain DNS (split-horizon) splitbraindns could help as well.