Something here may help.
https://techcommunity.microsoft.com/t5/system-center-blog/dpm-certificate-troubleshooting-8211-part-3-certificates/ba-p/346781
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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Hi,
I have a W2012 server that I upgraded to W2012 R2. I have DPM installed but it stops working when updating to R2.
The problem is in the certificates, to be able to read/write the backups.
In the MMC the folders DPMBackupStore and DPMRestoreStore are missing and I think that's the problem, I can't "link" the certificates with the DPM.
DPM Error:
24071 This DPM server is not authorized to read or write to this encrypted tape because there is no valid certificate in the DPMBackupStore and DPMRestoreStore that can decrypt data.
Any idea how to fix it?
(this "folders" are missing https://lh6.ggpht.com/-QhONzkidj_M/T0OxnwB7fUI/AAAAAAAAEEY/BccuTOhRZ04/8_thumb.png?imgmax=800)
Something here may help.
https://techcommunity.microsoft.com/t5/system-center-blog/dpm-certificate-troubleshooting-8211-part-3-certificates/ba-p/346781
--please don't forget to upvote
and Accept as answer
if the reply is helpful--