You can only have one Epassi account with the same phone number, so your former employer should delete your information before activating the new employer's account.
Contact your former employer and ask them to remove you from the Epassi system. After this, your current employer can create a new Epassi account for you with your phone number.
If you work for two different employers and you are entitled to both employers' Epassi benefits, one of the employers can create an Epassi account to you by adding an extra zero in front of your phone number and a working email address. By doing this, the accounts of your different employers can be linked and you can choose which employer's benefit you use for which purchase in the Epassi app User-section. Only one employer's benefit can be used for one purchase at a time.