diff --git a/include/bluetooth/services/fast_pair/fast_pair.h b/include/bluetooth/services/fast_pair/fast_pair.h
index 4b9c16814312..c39a1077bc6a 100644
--- a/include/bluetooth/services/fast_pair/fast_pair.h
+++ b/include/bluetooth/services/fast_pair/fast_pair.h
@@ -302,7 +302,8 @@ int bt_fast_pair_battery_set(enum bt_fast_pair_battery_comp battery_comp,
  *  This function can only be called before enabling Fast Pair with the @ref bt_fast_pair_enable
  *  API.
  *
- *  This function must be called in the cooperative thread context.
+ *  This function must be called in the cooperative thread context or in the system initialization
+ *  context (@ref SYS_INIT macro).
  *
  *  @param cb Callback struct.
  *
diff --git a/include/bluetooth/services/fast_pair/fmdn.h b/include/bluetooth/services/fast_pair/fmdn.h
index 4565a2102f4b..4c912a316bb3 100644
--- a/include/bluetooth/services/fast_pair/fmdn.h
+++ b/include/bluetooth/services/fast_pair/fmdn.h
@@ -14,9 +14,11 @@
  * @defgroup bt_fast_pair_fmdn Fast Pair FMDN API
  * @brief Fast Pair FMDN API
  *
- *  It is required to use the Fast Pair FMDN API in the cooperative thread context
- *  (for example, system workqueue thread). Following this requirement guarantees
- *  a proper synchronization between the user operations and the module operations.
+ *  It is required to use the Fast Pair FMDN API in the cooperative thread context.
+ *  API function exceptions that do not follow this rule mention alternative requirements
+ *  explicitly in their API documentation. Following the cooperative thread context
+ *  requirement guarantees proper synchronization between the user operations and the
+ *  module operations.
  *
  * @{
  */
@@ -234,6 +236,9 @@ struct bt_fast_pair_fmdn_ring_cb {
  *  You can call this function only in the disabled state of the FMDN module
  *  (see @ref bt_fast_pair_is_ready function).
  *
+ *  This function must be called in the cooperative thread context or in the system initialization
+ *  context (@ref SYS_INIT macro).
+ *
  *  @param cb Ringing callback structure.
  *
  *  @return 0 if the operation was successful. Otherwise, a (negative) error code is returned.
@@ -355,6 +360,9 @@ struct bt_fast_pair_fmdn_motion_detector_cb {
  *  You can call this function only in the disabled state of the FMDN module
  *  (see @ref bt_fast_pair_is_ready function).
  *
+ *  This function must be called in the cooperative thread context or in the system initialization
+ *  context (@ref SYS_INIT macro).
+ *
  *  @param cb Motion detector callback structure.
  *
  *  @return 0 if the operation was successful. Otherwise, a (negative) error code is returned.
@@ -529,6 +537,9 @@ struct bt_fast_pair_fmdn_info_cb {
  *  This API for callback registration is optional and does not have to be used. You can
  *  register multiple instances of information callbacks.
  *
+ *  This function must be called in the cooperative thread context or in the system initialization
+ *  context (@ref SYS_INIT macro).
+ *
  *  @param cb Information callback structure.
  *
  *  @return 0 if the operation was successful. Otherwise, a (negative) error code is returned.
@@ -565,6 +576,9 @@ struct bt_fast_pair_fmdn_read_mode_cb {
  *  You can call this function only in the disabled state of the FMDN module
  *  (see @ref bt_fast_pair_is_ready function).
  *
+ *  This function must be called in the cooperative thread context or in the system initialization
+ *  context (@ref SYS_INIT macro).
+ *
  *  @param cb Read mode callback structure.
  *
  *  @return 0 if the operation was successful. Otherwise, a (negative) error code is returned.
diff --git a/subsys/bluetooth/services/fast_pair/fp_gatt_service.c b/subsys/bluetooth/services/fast_pair/fp_gatt_service.c
index 702cf9ebbdb7..ef97b89a6cfd 100644
--- a/subsys/bluetooth/services/fast_pair/fp_gatt_service.c
+++ b/subsys/bluetooth/services/fast_pair/fp_gatt_service.c
@@ -851,8 +851,9 @@ static void fp_info_cb_account_key_written_notify(struct bt_conn *conn)
 
 int bt_fast_pair_info_cb_register(struct bt_fast_pair_info_cb *cb)
 {
-	/* It is assumed that this function executes in the cooperative thread context. */
-	__ASSERT_NO_MSG(!k_is_preempt_thread());
+	/* It is assumed that this function executes in the cooperative thread context
+	 * or in the system initialization context (SYS_INIT macro).
+	 */
 	__ASSERT_NO_MSG(!k_is_in_isr());
 
 	if (bt_fast_pair_is_ready()) {