Posted: Sat Jul 29, 2023 3:23pm
If it's been registered with a notary then it is legal and allows you to become a resident. One partner must be on the padron in the region you wish to become resident in. To actually register with a notary depends on the region with some saying you must prove you have lived together for 2 years, some for 1 years, others for 6 months and others with no living together rules at all.
Check with a notary to see if your certificate can be registered in Spain and then you should have no problems applying for residency.
Read this article from immigration Spain to clarify
https://www.immigrationspain.es/en/civil-partnership/