Οργάνωση και πρόσβαση στα στοιχεία επικοινωνίας στο Outlook.com
I will answer you in English based on your previous message. As a friendly suggestion, posting in Greek may help your question reach a wider audience and increase the chances of receiving assistance from other community members
As a workaround, check whether the affected contacts appear under People in classic Outlook or Outlook Mobile and try deleting them there. If you previously enabled contact syncing in Teams Mobile, also turn off Sync my device contacts under Settings > People.
If the contacts appear only in Outlook.com and are not visible in the other Outlook apps, there does not appear to be another user-side workaround. In that situation, please contact Microsoft Support and ask them to investigate the affected contact records.
Please note that this is a user-to-user support forum. Moderators and contributors cannot access accounts or Microsoft’s back-end systems. We can only provide technical guidance on reported incidents, requests and ideas
Thank you for your time and understanding