Does someone realize they were charmed after the effect of the Glamour bard’s Enthralling Performance wears off?

I have been playing a College of Glamour bard in the Tomb of Annihilation module. They get the Enthralling Performance feature at 3rd level when they choose the subclass (Xanathar’s Guide to Everything, p. 14):

If you perform for at least 1 minute, you can attempt to inspire wonder in your audience by singing, reciting a poem, or dancing. At the end of the performance, choose a number of humanoids within 60 feet of you who watched and listened to all of it, up to a number equal to your Charisma modifier (minimum of one). Each target must succeed on a Wisdom saving throw against your spell save DC or be charmed by you. […] This effect ends on a target after 1 hour, if it takes any damage, if you attack it, or if it witnesses you attacking or damaging any of its allies.

If a target succeeds on its saving throw, the target has no hint that you tried to charm it.

According to the description, the target does not become aware of the fact that someone attempted to charm them if they succeed at their saving throw. However, it doesn’t say anything about what happens if they fail their save and the charm wears off.

Once the effect of Enthralling Performance wears off, do those that were previously affected by it know they were charmed?

RAW and/or rules as interpreted, can a Glamour Bard use the Enthralling Performance ability while casting Motivational Speech?

Can the following two mechanics work together or are they mutually exclusive or require something else? I am the DM and both the player at my table and me don’t agree or understand if it’s possible to utilize Enthralling Performance in conjunction with the spell motivational speech.

Enthralling Performance (Glamour Bard ability)

Starting at 3rd level, you can charge your performance with seductive, fey magic.

If you perform for at least 1 minute, you can attempt to inspire wonder in your audience by singing, reciting a poem, or dancing. At the end of the performance, choose a number of humanoids within 60 feet of you who watched and listened to all of it, up to a number equal to your Charisma modifier (minimum of one). Each target must succeed on a Wisdom saving throw against your spell save DC or be charmed by you. While charmed in this way, the target idolizes you, it speaks glowingly of you to anyone who speaks to it, and it hinders anyone who opposes you, avoiding violence unless it was already inclined to fight on your behalf. This effect ends on a target after 1 hour, if it takes any damage, if you attack it, or if it witnesses you attacking or damaging any of its allies.

If a target succeeds on its saving throw, the target has no hint that you tried to charm it.

Once you use this feature, you can’t use it again until you finish a short or long rest.

Motivational Speech (Acquistions Incorporated, p.77)

3rd-level enchantment
Casting Time: 1 minute
Range: 60 feet
Components: V
Duration: 1 hour

You address allies, staff, or innocent bystanders to exhort and inspire them to greatness, whether they have anything to get excited about or not. Choose up to five creatures within range that can hear you. For the duration, each affected creature gains 5 temporary hit points and has advantage on Wisdom saving throws. If an affected creature is hit by an attack, it has advantage on the next attack roll it makes. Once an affected creature loses the temporary hit points granted by this spell, the spell ends for that creature.

At Higher Levels. At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the temporary hit points increase by 5 for each slot level above 3rd.

Would forcing a lawyer to turn on their client with a Glamour Bard’s Enthralling Performance feature be seen as an attack?

Say you are a bard, level 3+. You have are being sued by an enemy, and you have got their lawyer tied up in a chair. You make them charmed after their failed saving throw against your Enthralling Performance feature, which states:

Each target must succeed on a Wisdom saving throw against your spell save DC or be charmed by you. While charmed in this way, the target idolizes you, it speaks glowingly of you to anyone who speaks to it, and it hinders anyone who opposes you, avoiding violence unless it was already inclined to fight on your behalf. This effect ends on a target after 1 hour, if it takes any damage, if you attack it, or if it witnesses you attacking or damaging any of its allies.

Would charming the lawyer and making him throw out the case be seen as an attack against the lawyer’s ally, your enemy?