I have seen that “Every profile has a unique ID that you can find by navigating to the profile and looking at the URL. Look for the 26-character ID, as illustrated in the image below.”
This is wrong. I have seen profiles ID such as “Yzgepw”. What’s the story?
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Ah, yes! Both are correct. Klaviyo increased the character count of profile IDs to future-proof growth in overall subscriber data. A 6-character ID simply means that subscriber was acquired prior to the update.

Hope that helps!
See this link:
https://help.klaviyo.com/hc/en-us/articles/12902308138011
about half way down - “Every profile has a unique ID that you can find by navigating to the profile and looking at the URL. Look for the 26-character ID,...”
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