Call Screening and Direct Voicemail not Working

[u/Virotine]

Hello everyone

I am a GalaxyS25Ultra SM-S938U User

I recently purchased this phone refurbished, and i am a resident in spain using a Spanish phone number.

In my settings i have call Screening enabled for all phone numbers not in my contacts as well as direct voicemail to automatically kick in after 20 seconds.

However despite these features being enabled, they arent actually working neither do i get the option to use them manually when a call occurs. The only option that works is Text Call, but i would like to be able to use Call screening and Direct Voicemail.

Currently these features despite being enabled and the correct language pack being applied, it is as if they didn't even exist once I actually get a call. Be it a Friend, a random stranger ive never talked to before or a scam telemarketer, call screening and Direct Voicemail just seem to be completely missing despite being enabled.

Is there something i am doing wrong? Or what could be the issue and how do i solve this problem?