Security: 2FA causing issues

[Marlece]

• I have a domain:  thoughtswift.com
• I have 5 employees who have various emails and are in different locations and use different laptops all who have the Name@thoughtswift.com   ((PII Removed by Staff), (PII Removed by Staff) etc....)
• We have a drive dedicated to our client Long Term Care Specialists to which the drive is: (PII Removed by Staff). 
• We are having issues with my various employees logging into the client drive which has all the links associated with performing items for the client (unique links, email etc.....)
• Every time my 5 employees log into the (PII Removed by Staff) it generates a g-code to the recovery number (me) and I have to submit to them a g-code so they can start working with the link and the drive.  
• We have done it this way for 12 years.  We have 2FA turned off.  for the organization and for the employee.  Only recently has it given us issues.
• This is obviously causing issues.  I want my employees to provide a password (123ltcs!) and get in the drive without triggering a g-code need.  I submit a g-code 3-4 times a day.  We used to be able to do this. Now we are not able to navigate with the security features.
• How do I set up my account to have these employees approved to access (PII Removed by Staff) without triggering a g-code?  Is it a group, an organizational unit .....  I am at a loss.  Thank you for your guidance