try this:
1. Use Compose action and inject your array as input
2. Using expression, Change Compose output into string, string(outputs(‘Compose’))
3. Using expression, separate( delimit) your Compose output from step 2 by comma, split(output(‘Compose_2’), ‘,’)
4. Then pass the output of step 3 to your Append to array variable action.
5. finally pass the output of step 4 to your send an email action
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