Note Im not a Jmix employee and have not used any of the following options. In addition, I am still on jmix 1.5 and on the classic UI at least until all addons are ported to 2.x so make sure this works on your version and chosen UI platform. I have zero experience with flow UI.
But I think you can draw inspiration here:
- The concept of routes allows opening a screen based on the url
- the multitenancy plugin documentation uses query parameters to deduce the tenant. You could use the same mechanism to include the password and prefill the username password with values from the url.
- another option is implementing a custom authentication provider. This post explains it in the concept of MFA