netatmo has made various changes to the authentication infrastructure in May 2024. myatmo takes these changes into account, but you must be sure that you observe the following things:

Please follow these instructions step-by-step:

• Open the official netatmo app, tap on the menu icon in the top left corner, select ‘My Account’ >>> ‘Partner Apps’.
• Remove all listings of myatmo in the list of partner apps by tapping on a myatmo entry and then selecting ‘Remove access’.
• Then delete myatmo from all your devices, including devices using an outdated iOS version.
• Switch your devices off and then on again. This step is very important!
• Reinstall myatmo on your devices. Please note that at least iOS 15 is required to use myatmo.
• Start myatmo, follow the instructions for authentication.

This will fix potential authorization problems.