Hello!
Looks like plugin repository is not working this year. All plugin updates starting from January are only visible in UI, no in JSON feed. And cannot be installed using composer. Just check latest JSON:
https://plugins.roundcube.net/p/provider-latest$b35819e741aa804b3e3d7d866780...
Only three plugins! It should contain mach more of them, updated January and February this year, including ident_switch.
Can someone check it please?