This requirement of multifactor authentication (MFA) for every login is controlled by your specific financial institution, as some institutions have increased security measures. Nimbl cannot make any changes to this requirement.
Also, check your bank account settings or preferences, many times under “Security” on their website. Some banks may require you to opt in to sharing transaction details with third-party apps. Opting in may ensure that you have a consistent connection to your bank account to avoid reauthentication.