Is the Foundation in Professionalism module necessary for affiliates?

This relates to Foundation level qualifications, not the ACCA qualification. To quote from the ACCA site:

So if you study for any of our Foundation-level qualifications and want a certificate as proof of the exams you have completed, you are required to complete Foundations in Professionalism. This is an online, interactive module, designed to help you develop your understanding of what it means to act professionally and ethically in the work you carry out.

You can complete Foundations in Professionalism before or after completing the exam component of the qualification you are aiming to achieve and you only need to successfully complete the module once, even if you decide to complete one or more of our qualifications.

There is no set time allocated to completing Foundations in Professionalism. We encourage you to complete the module at your own pace to allow you to reflect on what you have learnt.

You can access Foundations in Professionalism via myACCA.