In أَمْ مَنْ, the mīm at the end of أَمْ is sākin, and the mīm starting مَنْ is vowelled. Merge the former into the latter, producing a doubled mīm with ghunnah.
Practise in three passes: locate both mīms; name the rule mīm idghām; then listen and produce the whole connected phrase. Do not insert an extra vowel after the first mīm.
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In أَمْ مَنْ, the mīm at the end of أَمْ is sākin, and the mīm starting مَنْ is vowelled. Merge the former into the latter, producing a doubled mīm with ghunnah.
Practise in three passes: locate both mīms; name the rule mīm idghām; then listen and produce the whole connected phrase. Do not insert an extra vowel after the first mīm.