fix(backend-services): backend invite codes

[jdvlio]

Backend corrections for the invite code functionality

[netlify[bot]]

✅ Deploy Preview for nautilus-wallet-staging canceled.

Name	Link
🔨 Latest commit	1b6610099837bfd7aea30b1a737c43ea6b437653
🔍 Latest deploy log	https://app.netlify.com/sites/nautilus-wallet-staging/deploys/6447a7f49ce58a0008e9047e

[codecov-commenter]

Codecov Report

Merging #552 (1b66100) into main (eac2b73) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #552   +/-   ##
=======================================
  Coverage   47.68%   47.68%           
=======================================
  Files         172      172           
  Lines        2760     2760           
  Branches      527      527           
=======================================
  Hits         1316     1316           
  Misses       1444     1444           

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