Is It Possible to Use a Single Email and Phone Number to Create Several App Accounts?

No and Yes. No for using the same email and Yes for the same phone number.

Accounts on Taxes To Go Apps are attached to the email address used to create them. A single email address cannot be used to create multiple accounts. Already used email addresses are barred from creating another account.

On the other hand, however, one phone number can be used for different accounts.