I've been trying to add additional owners to a Google Webmaster Tools account, but receiving this error message:
We weren't able to add email@example.com. Please try again later.
Has anyone come across this before or discovered a solution?
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From a bit of trial-and-error, it appears that Google limits you to adding approximately 3 owners per hour. I waited 1-2 hours and it allowed me to add an additional 2-3.
Hope that helps others facing this vague error message.