Until the spell ends, when you make a Charisma check, you can replace the number you roll with a 15. Additionally, no matter what you say, magic that would determine if you are telling the truth indicates that you are being truthful.
The 2024 Player’s Handbook revised many spells, and the SRD 5.2 carries the new text. What changed from the 2014 version above:
Its school changed from Transmutation to Enchantment.
Casting time
Action
Range
Self
Components
V
Duration
1 hour
School
Enchantment
Level
8
Classes
Bard, Warlock
Until the spell ends, when you make a Charisma check, you can replace the number you roll with a 15. Additionally, no matter what you say, magic that would determine if you are telling the truth indicates that you are being truthful.
2024 version from the SRD 5.2. Most tables settle on one edition, so check which one yours uses.