Confused about stress pronouns vs. indirect object pronous

Kate, 

you are right with your thought that the reflexive verb is relevant. 

Pronominal verbs followed by the preposition ‘ de ‘ or ‘ à ‘ require either the use of the adverbial pronoun ‘ en ‘  or ‘ y ‘ respectively where ‘allowed and appropriate’, or the use of the stress pronoun. 

There are also a number of ‘standard’ verbs followed by ‘ à ‘ that cannot have an indirect object pronoun either. 

The attached link covers this area :

 https://www.lawlessfrench.com/grammar/indirect-objects-2/ 

There are also other situations in which the stress pronoun is required

 Moi/toi/lui/elle/soi/nous/vous/eux/elles - advanced usages (French Stress Pronouns)