The MVNCENTRAL and OSSRH projects are now read-only and will be accessible for a few more weeks so that you can refer to previously created issues when sending support requests to central-support@sonatype.com
If you currently publish to Maven Central via oss.sonatype.org or s01.oss.sonatype.org, this change only impacts how you request publishing support, which you can now do by emailing central-support@sonatype.com. There should be no impact to your existing permissions or publishing processes.