If you are unable to connect to the Benley SelectServer to renew your status, the licenses will expire. As a result, when you go in, views will not appear.
When licenses expire, and users continue to use the product, some modules may be deactivated, which in turn disables the modules' associated views.
Even once they are enabled from a licensing standpoint, you will need to visit each site & ensure the correct modules are active.
To do so:
Once you have done this, you will need to restart all APM services to ensure they are working correctly.
Also, check that the CMMS ID has not been reset to its default. It should be set back to the correct value before any inbound integration events are processed, otherwise they will likely fail.
https://communities.bentley.com/products/assetwise/asset_performance_management/w/internal_support_solutions/35435/select-license-renewal-process-sometimes-results-in-site-modules-being-disabled