Appliance: MX64W
Current version: MX 15.42.1
SSID Name: "The Real Prodigy"
No issues at my end. Windows, MAC, Android, Garmin, Nintendo Switch... all are connecting flawlessly.
EDIT:
Found this: https://documentation.meraki.com/MR/Wireless_Troubleshooting/Wireless_Issue_Resolution_Guide
Check out the "Test an SSID with Minimal Configuration Settings" section. You may try that out to see if the issue with the SSID itself, or DNS (Section: Clients not Getting Internet Connectivity).
Cheers