I put everything on right place , no spaces , correct username/ password+securityToken Its not working !/I tried using POSTMAN to authenticate Salesforce with https://login.salesforce.com/Services/Soap/c/49.0

Hi ,

https://MyDomainName.my.salesforce.com/services/Soap/c/49.0/

Availability and Enforcement  

Enhanced domains are available in all orgs. All qualifying orgs created in Summer ’22 or later get enhanced domains by default.

Enhanced domains were required for sandboxes and non-production orgs in Winter ’23 unless you enabled an org-level setting that postponed their enforcement until Spring ’23. Non-production orgs include demo orgs, Developer Edition orgs, free orgs, patch orgs, Trailhead Playgrounds, and trial orgs. Enhanced domains are also enabled by default in new, refreshed, and cloned sandboxes. To disable that behavior, see Enable Enhanced Domains in New and Refreshed Sandboxes.

https://help.salesforce.com/s/articleView?id=sf.domain_name_enhanced_considerations.htm&type=5