Contradiction with Matthew 6:6
This verse suggests that prayer should be a private matter, whereas 2 Chronicles 6:29 involves communal prayer in a public setting.
Matthew 6:6: But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.
Contradiction with Matthew 6:7
This verse advises against using vain repetitions in prayer, while 2 Chronicles 6:29 implies bringing common issues to God in prayer, which could involve repeated concerns.
Matthew 6:7: But when ye pray, use not vain repetitions, as the heathen [do]: for they think that they shall be heard for their much speaking.
Contradiction with James 4:3
This verse warns that prayers may not be answered if asked with wrong motives, whereas 2 Chronicles 6:29 suggests that heartfelt prayers for common human struggles are heard by God.
James 4:3: Ye ask, and receive not, because ye ask amiss, that ye may consume [it] upon your lusts. [lusts: or, pleasures]