Sometimes changing your time zone(know it sounds weird but happened to me) and then change back to your correct time zone will fix the glitch). Also toggle between data and WiFi, or simply go in airplane mode, restart your phone, leave airplane mode and try again.
Lastly whatever account your using, Game Center, google, Facebook etc try logging out of it and logging back in
Hey there, @MrCopierre, I can vouch for the troubleshooting steps that were recommended here! If the issue persists, however, reach out to our team at support+forums@ludia.com and we’ll try to take a closer look at things on our end. Hope everything works out!