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I've moved your post to this thread as it's related to the same subject.
You can find the info you're looking for in the solution above.
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I see this issue is still not resolveble by the customers themselves since 2018.
Moved to QC and voicemail changed to French. Not able to change language.
Even tried changing the voicemail number to 647...... but still communicates in French with no option to switch to english.
Not sure how this works but need it changed back to English.