@Naresh_Bhardwaj, disabling the Meraki mesh functionality is unlikely to solve your problem. The AP is going into Repeater mode because it’s not getting an IP address from a DHCP server. Disabling mesh will just mean if it can’t get an IP address it will effectively do nothing.
You’ll need to do a packet capture on the link between the AP and the switch to troubleshoot the issue - see if proper DHCP request and response packets are being sent. If it is a new AP then it is entirely possible that the Ethernet interface is faulty, but you’ll need packet captures to confirm that.
When I configure APs, I make sure the switch port the AP is connected to is configured for access mode, on a VLAN that has DHCP, and has access to the internet. I usually use a vlan configured for user desktop PCs.