There is rarely one right answer. Here are several categories of pairing options, each with a reason it may work.
Baby Pink
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
White
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Off-White
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Linen
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Thistle
Enough lightness contrast to read as two distinct colours without feeling harsh.
Silver
Enough lightness contrast to read as two distinct colours without feeling harsh.
Sand
Enough lightness contrast to read as two distinct colours without feeling harsh.
Mushroom
Enough lightness contrast to read as two distinct colours without feeling harsh.
Prussian Blue
Strong lightness contrast and saturation for a bold, graphic pairing.
Tyrian Purple
Strong lightness contrast and saturation for a bold, graphic pairing.
Cinnamon
Strong lightness contrast and saturation for a bold, graphic pairing.
Burgundy
Strong lightness contrast and saturation for a bold, graphic pairing.
Lavender Blush
A low-chroma neutral lets the original colour stay the visual focus.
White
A low-chroma neutral lets the original colour stay the visual focus.
Off-White
A low-chroma neutral lets the original colour stay the visual focus.
Linen
A low-chroma neutral lets the original colour stay the visual focus.
Navy Blue
A saturated accent from a different hue family for a deliberate pop of contrast.
Midnight Blue
A saturated accent from a different hue family for a deliberate pop of contrast.
Indigo
A saturated accent from a different hue family for a deliberate pop of contrast.
Prussian Blue
A saturated accent from a different hue family for a deliberate pop of contrast.
Black
Meets WCAG AA contrast (19.0:1) for normal text if used as text/background.
Navy Blue
Meets WCAG AA contrast (14.5:1) for normal text if used as text/background.
Midnight Blue
Meets WCAG AA contrast (13.5:1) for normal text if used as text/background.
Prussian Blue
Meets WCAG AA contrast (12.2:1) for normal text if used as text/background.