I have encountered this issue while community to enterprise migration and it was happening since the base table ‘oauth_consumer‘ was not available.

CREATE TABLE oauth_consumer (   entity_id int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'Entity Id',
   created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'Created At',
   updated_at timestamp NULL DEFAULT '0000-00-00 00:00:00' ON UPDATE CURRENT_TIMESTAMP COMMENT 'Updated At',
   name varchar(255) NOT NULL COMMENT 'Name of consumer',
   key varchar(32) NOT NULL COMMENT 'Key code',
   secret varchar(32) NOT NULL COMMENT 'Secret code',
   callback_url text COMMENT 'Callback URL',
   rejected_callback_url text NOT NULL COMMENT 'Rejected callback URL',
   PRIMARY KEY (entity_id),
   UNIQUE KEY OAUTH_CONSUMER_KEY (key),
   UNIQUE KEY OAUTH_CONSUMER_SECRET (secret),
   KEY OAUTH_CONSUMER_CREATED_AT (created_at),
   KEY OAUTH_CONSUMER_UPDATED_AT (updated_at)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='OAuth Consumers';