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Six-digit pin works well for me in European countries - Czechia, Germany, Austria, Spain, Italy.

My girlfriend used a 5-digit PIN for over 10 years in the UK and never had any issues that I can recall.

I’d change mine too except I use the PIN so infrequently (99% contactless now days) I’m worried I’d forget the new one!

Just try and be surprised - no issues.

just don't try to use it in some remote exotic place, 4 places are often hardcoded but you may still be able to withdraw/pay, or not

Mine is eight digits, never tried it outside Canada yet.