All GDPR features require a "User Consent Database Repository (GDPR)", which must be configured in the Loginapp's advanced settings.
Consent Management requires the database table user_consent. Please ensure that your database has this table before using this feature.
See 6.2.1. Relational databases for IAM for up-to-date database schema templates for supported databases.
If upgrading existing database schemas, make sure to not only add the new table, but also the indices provided in the schema templates.