We are the developer of TimeBlocks.

We are informing you that the API requested by apps version 5.0 or lower has been discontinued.
The terminated APIs include APIs that may affect users' data synchronization, which may cause problems with data restoration and synchronization when changing devices or reinstalling the app.

Therefore, if you have not updated the app since January 2021, or if it is confirmed to be version 5.0 or lower in Settings - App version, please be sure to update to the latest version.
In addition, even if it is version 5.0 or higher, some operation errors may occur in versions 5.3.24 or lower for iPhone and 5.3.15 or lower for Android, so please keep updated to the latest version.

If you have any problems with the update, please contact support@timeblocks.com.
thank you