Phone verification for account setup

I tried submitting a help ticket twice, but I don't believe it went through because there were no confirmation messages or emails. So, I'm going to submit my question here as well.

I am a web developer and one of the services I offer my clients is setting Zoho email up for their domain. Given all the technical aspects of doing this, I do the set up from start to finish. However, I noticed that you are now requiring a mobile phone for verification before I can set up a new account. This normally wouldn't be a problem, but it wouldn't let me use a number that I had already used for my own Zoho email account (archerms.com). So, on the account I set up this week (pacificdragonbox.com) I used a secondary number of mine and it worked fine. But, I'm now out of numbers I can use and won't be able to set Zoho up for my next client. Is there a way I can "release" my secondary number from being tied to the pacificdragonbox.com account so I can re-use it? I see there is a Profile > Phone Numbers section ( https://accounts.zoho.com/u/h#profile/phonenumbers) - would that do the trick? If not, how can I do this?

Thanks for your help,
Jason