I think AML is an implementation for the European E112 service (“Enhanced” 112).
Looking at the wikipedia article, it references the EENA web site https://eena.org/our-work/eena-special-focus/advanced-mobile-location/, where it states:
The European Electronic Communications Code (Directive 2018/1972/EC) makes it mandatory for all the Member States of the European Union to make use of handset-derived location to locate people calling emergency services starting from December 2020. AML is a technology that enables the provision of such information and thus, ensures compliance with this legislation.
Starting from March 2022, all the smartphones sold in the European single market will have to offer the possibility to send handset-derived location information of the caller to the emergency services. This is already the case for a large majority of smartphones, namely all Android and iOS phones.
IANAL, but to me it looks like that all smartphones for sure by now MUST offer at least the possibility to provide AML, but it is not compulsory to have it activated?