Unable to release snapshot using maven-release-plugin

When releasing SNAPSHOT using maven-release-plugin < mvn clean deploy -P sonatype-staging -s settings.xml> I get: 

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[*ERROR*] Failed to execute goal org.sonatype.plugins:nexus-staging-maven-plugin:1.6.7:deploy (injected-nexus-deploy) on project grammaticus: Failed to deploy artifacts: Could not transfer artifact com.salesforce.grammaticus:grammaticus:jar:1.1.0-20190617.065530-1 from/to ossrh (https://oss.sonatype.org/content/repositories/snapshots): Access denied to: https://oss.sonatype.org/content/repositories/snapshots/com/salesforce/grammaticus/grammaticus/1.1.0-SNAPSHOT/grammaticus-1.1.0-20190617.065530-1.jar, ReasonPhrase: Forbidden. -> [Help 1]

[*ERROR*]

[*ERROR*] To see the full stack trace of the errors, re-run Maven with the -e switch.

[*ERROR*] Re-run Maven using the -X switch to enable full debug logging.

[*ERROR*]

Please find the pom.xml here:

https://github.com/salesforce/grammaticus/blob/master/pom.xml

Please find the settings.xml  file  as an attachment.

I am suspecting it could be access issues. Could you please help ?