As of yesterday, a new version of HCL Notes 12.0.1 German mail template is available, which incorporates the fixes for the following SPRs:
SPR # PDARCBQ86U >> DOMI: MSTeams meeting is not getting updated with new URL when user opens the accepted reschedule invite
SPR # PDARCC68MC >> DOMI: Reschedule meeting notice displays the old url for MSTeams meeting when chair accepts the counter
You can find the new version of the HCL Notes 12.0.1 German mail template in the KB0097354 article.
Hope this helps! 🙂
Thoughts about HCL Connections, Domino and Sametime 
I searched flexnet, are the templates not published there?
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No, you can get them only via the download link in the KB.
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