I keep running into cases where commands (migrate-import, migrate-status) cannot find migrations. Usually I'm trying to run a migration, so I start with mi and then run ms when that is not found, which results in an empty result. This especially happens when using the same DB/code/config on a different host (develop locally, put everything on staging, then migrations not found).
I have tried diagnosing a bit and have noticed:
$manager = \Drupal::service('plugin.manager.migration');
$plugins = $manager->createInstances([]);
var_dump(array_keys($plugins));
This may be heavily related to the issues above, but I'm trying to assess if there is a way for me to get this working.
Drupal version: 8.2.6
Postponed: needs info
6.0
Drush commands
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Chiming in with my case:
If you use a custom source plugin, make sure source_module in the annotation is set to an enabled module in the source site.
drush migrate:import <migration_id> will just report "No migrations found", while log messages contains a message "Migration did not meet the requirements." with mention of the offending source_module.
Had the same issue when installed the taxonomy_machine_name → module.