The SAP key mechanism is broken.
You can use this site SAP Tools – Your One-Stop Solution for SAP Troubleshooting to generate any developer key, SSCR key, maintenance key, license key.
Needless to say: use is at own risk!
SAP tools for keys
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Blog for SAP technical guru's: SAP basis, SAP security and authorization, SAP ABAP, SAP Focused Run