fixes for treshold keys and reuse old privateKeys

[Coiling-Dragon]

Detailed description:

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Checklist

• [ ] Documentation added
• [ ] Tests updated

[codecov[bot]]

Codecov Report

Merging #884 (f1673ad) into main (1e420ff) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #884   +/-   ##
=======================================
  Coverage   63.81%   63.81%           
=======================================
  Files          84       84           
  Lines        6437     6437           
=======================================
  Hits         4108     4108           
  Misses       2126     2126           
  Partials      203      203           

Flag	Coverage Δ
unittests	63.81% <ø> (ø)

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