Help with access

[Devin Howard]

When I try to push code to the remote/origin repository, I’m always met with a “

git -c diff.mnemonicprefix=false -c core.quotepath=false —no-optional-locks push -v origin (my ticket #):(my ticket #)

remote: HTTP Basic: Access Denied 

Fatal: Authentication failed for ‘(URL)’

pushing to (URL)

Completed with errors. 
I’ve verified my authentication in Tools option. I’m able to push using the terminal but not in SourceTree. I use the Yubikey (not SSH key) for my access the gitLab.  

Can help me out? 
thank you,

Devin Howard